The Newcastle School District was first alerted to the situation by elementary and middle school girls who reported they were being stalked on Instagram. District officials said they have a list of 60 people they believe the man is stalking.

Authorities said the man was contacting the girls on Instagram and in some cases, asking to meet the girls. He also reportedly asked girls for inappropriate photos.

"We had around six or seven students that we know were contacted," said Superintendent Tony O'Brien.

Once the students notified teachers, the administration alerted parents and police.

"We just think the world of (these girls)," O'Brien said. "We want to keep them safe."

Police are still looking for the person responsible for the messages to the girls.